Process for forming plaster board



LSCHUMACHER.

PROCESS FOR FORMING PLASTER BOARD. APPLICATIOIN FILED JAN. 26, 1921.

Patented May30, 1922..

3 SHEETS-SHEET 1- jzvrzioz? v ozz 66%21277407562 J. SCHUMACHER.

PROCESS FOR FORMING PLASTER BOARD.

APPLICATION FILED JAN. 26,1921.

Patented May 30, 1922.

JOHN SCHUMACHER, 015 LOS ANGELES, CALIFORNIA.

PROCESS FOR FORMING PLASTER BOARD.

as er.

T 0 all whom it may concern:

Be it known that 1, JOHN SoHUMAoHER, a citizen of the United States, and residing in the city of Los Angeles, county of Los Angeles, and State of California, have-invented new and useful Improvements in a Process for Forming Plaster Board, of which the following is a specification.

This invention relates to a process for making plaster board having a predetermined warped surface, and pertains especially to a board adapted to be used for columns, coves, and the like places.

In the use of plaster board in buildings, it is often desirable to have board of various degrees of curvature suitable to cover cylindrical columns or to produce the eflect of cylindrical columns. Suohboard is also servicable for coves and is useful in various other places. The present invention relates to board of this character.

It is the primary object of this invention to provide a process and means for efiiciently forming such board into its final shape. Another object of this invention is to provide means to carry out the process, which requires a minimum'of space, a small degree 0t skill upon the part of the operatives, and produces a superior article.

.A still further object of this invention is to provide a process and means whereby a number of boards of varying degrees of curvature may be formed at one and the same time and especially in stacked relation. A still further object of this invention is to. provide boards which may be nested for compact shipment.

In the accompanying drawings, an apparatus is disclosed for carrying out the process, in which:

Fig. 1 is a side elevation of a car having mounted thereon apparatus for forming the board; Fig. 2 is an end view on an enlarged scale lobking in the direction of the appended arrows marked 2-2 in Fig. 1; Fig. 3 is a section of a fragment of the car and apparatus taken on the line 3-3 of Fig. 2; Fig. 4 is an elevation similar to Fig. 1 showing the apparatus with parts arranged for trimming of the board; Fig. 5 is an enlarged section taken on the line 55 of Fig. 4; Fig. 6 is a vertical fragmentary" section on an enlarged scale showing theapparatus arranged for trimming the ends of the board; Fig. 7 is a perspective view show- Specification of Letters Patent. Patented Niay 30, 1%22. Application filed January 26, 1921. Serial No. 439,976.

ing the parts of the form before being locked; and Fig. 8 is a perspective view showing a bundle of board ready for crating or shipment.

Referring more particularly to the drawings, A indicates a car mounted upon wheels for convenient transportation of the car from place to place. Mounted upon the car is the mold form indicated by B in which the plaster board is given its final shape. Referring particularly to Figs. 4 and 5, saws C for trimming the edges ofthe plaster board D are shown. Referring particularly to Fig. 6, asaw E for trimming the ends of the plaster board is indicated.

' The car is provided with a floor 9 supported upon a frame work forming the bed of the car. Adjacent the end of the car, the floor has openings indicated by 10, see

Figs. .2, 3, and 6. Extending transversely across the openings 10 are rods 11 which are firmly secured to the floor, and serve for anchoring hooks thereto, as will be later described.

Supported upon the bed of the car is a form box 12 having flanges 13 extending from the ends at the lower edges; Extend; ing longitudinally of the box is a semi -cylindrical recess 14 having a diametrical plane flush with the top of the box. End pieces in correctly positioning the end pieces upon the box. The end pieces serve to hold the waste ends of the plaster board while initially drying, as is best shown in Fig. 3. To hold the edges of the plaster board while drying, side bars 18 are provided. These bars are placed in position upon the upper side of the box, and may be conveniently held in such position by means of dowel pins.

A semi-cylindrical core 19 is provided,

andis of such a length that its ends are flush with the box when the end pieces are attached thereto. Secured to the ends of the core are brackets- 20 slotted on the extended legs to receive a tie bar 21. Each tie The end I The hooks and eyes indicated 90 bar has a hook at the lower end which engages a rod 11 and is threaded at the'upper end to receive a hand nut 22, whereby the core may be locked in position and pressure brought to bear upon the plaster board D contained in the form.

The apparatus is operated in the following manner:

The box is placed uponthe car, the end pieces 15 locked in position, and the side bars 18 placed upon the box. Green plaster board is then laid in the box, one board upon the other, until the requisite number of boards have been placed therein. A pile is thus formed, and as the plaster board in its green state is flexible, it conforms to. the contour of the recess. The ends overlap the junction of the end pieces 15 and the box 12. The edges overlap the 'unctions of the box and the, side bars. ore 19 is then ..placed in position, tie bars 21 hooked to any other fraction, as desired.

rods 11, and the hand nuts screwed to bring pressure tobear upon the core and plaster board D in the box: This clamps the board in osition.

he plasterboard is now allowed to initially dry locked in the form. After it has initially dried, the side bars 18 are removed. The saws C are then operatedto trim the edges as indicated in Figs. 4 and 5. After the edges have been trimmed, core 19 is removed, and saw-E operated to trim the ends. The resulting product is semi-cylindrical plaster boards .of various degrees of curvature exactly cut and nested, within one another. The roduct is then finally dried and ready for s ipment in its finished form. It is obvious; that the boards may again be assembled and nested within one another. Two nests of board may then be placed upon one another to form a cylindrical bundle,

which may be fastened together in any suitable manner as by straps 23. This bundle may be crated or packed in any suitable carrier for shipment. The weight of the-package per'volume is thus a maximum.

Although I have illustrated a particular apparatus for forming the board, I do not limit myself to the use of the specific instrumentalities shown. Furthermore, the board may be half round, quarter round or What I claim is:

1.,The process of shaping plaster board comprising forming sections of green plaster boa-rd, stacking said sections upon a warped surface corresponding to the shape desired and having an outline corresponding to the edges of the finished board, causing said board to conform to said surface,

' maintaining said board thereon until it has first mentioned surface and having edgesaligning with the edges of the said first mentioned surface, and causing the board to set therein.

3. The process of shaping plaster board comprisingforming sections of green plasterboard, stacking said sections upon a warped surface corresponding to the shape desired, clamping the sections to said surface, and causing the board to set thereon. 4. The process of shaping' -plaster board comprising forming sections of green plaster board, stacking said. sections upon a warped surface corresponding to theshape desired, placing thereover a surface corresponding to the first mentioned surface, clamping the board between said surfaces, and causing the board to set therein.

5. The process of shaping plaster board comprising forming sections of green plaster board, stacking said sections upon a warped surface corresponding to the shape desired and "having an outline corresponding to the edges of the finished board, placing thereover a surface corresponding to the first mentioned surface and having edges aligning with the edges of the said first .mentioned surface, clamping the board be tween said surfaces, causing the board to set therein, and trimming the board at the edges of said surfaces.

6. The process of shap'ing plaster board comprising forming sections of green plaster board, stacking said sections upon a warped surface'corresponding to the shape desired, and causing the board to set thereon. 

